I'm not sure whether music actually helps me or not to be true. I tend to find headphones too much of a distraction when I'm tossing and turning, but don't really have a stereo to use or anything. Things I have listened to in the past though would be Damien Rice and Ludovico Einaudi, so east-listening really. I wouldn't listen to anything overly full of energy.

Most commonly I listen to audio-books to help me to sleep. I find those are the most soothing. However, then I find myself not remembering some of what was said when I fell asleep so it's a win-lose situation.